Chapter 5, Problem 5.52P

The thermal effiency of a general heat engine is 35 percent, and it produces 60 hp. At what rate is heat transferred to this engine, in kJ/s?

The first law of thermodynamic is dealing with the quality of energy Ture O False O

and finally find the volume rate in ft3/day

The temperature of a 500 gram closed system was 10 C. By an electric heater, Energy of 2000 calories is added to the closed system for 1 hr. The surrounding does work of 1000 Joule on the systems. If the final temperature of the closed system is 120 C, Given 1 calorie = 4.2 Joule (a) Estimate the power (in kW) of the electrical heater used. (b) Calculate the specific heat capacity of the iron cylinder...

8. A piston-cylinder arrangement contains 1 kg mass at 142.5 kPa. The volume is increasedfrom 1 m3to 3 m3. The approximate boundary work of the system isa. Cannot be find since some data is missingb. 285 kJc. 0 kJd. 0.285 kJ

While 45 kJ / min heat loss occurs from a room containing air to the environment, work input to the room at a speed of 1.2 kW from computers, TVs and lamps realizes. So what is the change in the energy of the air in the room after 30 minutes?

A heat pump is used to maintain a space at 25 C during winter while the outdoor temperature is 10 C. The total rate of heat 1) loss from the space to the outside is 20 kW. The power (in W) needed to drive this heat pump (assuming it is reversible) is Select one: 806 1016 906 1006

imagine a heat machine that operates between two thermal reservoir T1<T2 ,the machine does a work in quantity W,and it exchange heat in quantity Q1 and Q2 with its reservoirs.( Note:  this heat machine dose not have to be a carnot machine , only requirement is that it must be cyclical).under this circumstances,if the work is positive,prove that Q2>0 and Q1>0.

A heat pump absorbs 10 kW of heat from outside environment at 250 K while absorbing 15 kW of work. It delivers the heat to a room that must be kept warm at 300 K. The Coefficient of performance (COP) of the heat pump is